Multicenter study investigating long-term survival after synovial lavage of contaminated and septic synovial structures in horses presented to 10 UK referral hospitals.
Authors: de Souza Therese C, Burford John, Busschers Evita, Freeman Sarah, Suthers Joanna M
Journal: Veterinary surgery : VS
Summary
# Editorial Summary: Long-term Outcomes After Synovial Lavage in Equine Septic Arthritis De Souza and colleagues' multicentre analysis of 240 adult horses treated for contaminated and septic joints across 10 UK referral hospitals provides valuable prognostic data on a common and serious orthopaedic emergency. Over a 15-month recruitment period, the team collected detailed surgical and outcome information, then followed up with owners at least 365 days post-operatively to determine long-term survival rates and identify risk factors affecting prognosis. Whilst discharge survival was excellent at 95% (228 horses), long-term survival to beyond one year was 89.4%, with Cox regression analysis revealing that unknown aetiology, longer operative time, increased body weight, forelimb location, and involvement of tendon sheaths or bursae were all independently associated with poorer outcomes. For practitioners, these findings offer quantifiable prognostic parameters when counselling owners: horses with idiopathic injuries, greater weight, or structures beyond the joint capsule face genuinely diminished survival prospects, whilst operative efficiency appears to influence long-term prognosis—underscoring the importance of swift, effective lavage rather than protracted surgical time. This evidence-based framework enables more transparent conversations about realistic expectations following synovial sepsis, particularly in those higher-risk categories.
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Practical Takeaways
- •Synovial lavage for septic synovial structures has excellent survival outcomes, with ~9 in 10 horses surviving long-term; this can be used as prognostic information when counseling owners
- •Forelimb injuries, particularly involving tendon sheaths or bursae, carry a worse prognosis than joint sepsis and may warrant more guarded initial discussions with owners
- •Surgical efficiency matters—prolonged surgery time is associated with poorer survival, so minimizing anesthesia duration should be a surgical priority in these cases
Key Findings
- •Survival to discharge was 95% (228/240) and long-term survival was 89.4% (185/207) after synovial lavage for septic synovial structures
- •Unknown cause of injury, increasing surgery duration, increasing body weight, forelimb involvement, and involvement of tendon sheaths/bursae were independent risk factors for death
- •Tendon sheath and bursa injuries had significantly worse outcomes compared to joint sepsis
- •Each additional hour of surgery was associated with reduced long-term survival probability